VOCs (volatile organic compounds) gas recovery device for blowdown system of gas compressor

Abstract

The utility model relates to a VOCs (volatile organic compounds) gas recovery device for a gas compressor blowdown system, which belongs to the technical field of environment-friendly treatment and comprises an equipment base, a gas-liquid separation buffer tank body is arranged on the inner side of the equipment base, and two supports are fixedly mounted between the bottom of the gas-liquid separation buffer tank body and the inner bottom wall of the equipment base. A liquid collecting pit is formed in the right side of the interior of the gas-liquid separation buffer tank main body, a manhole communicated with the interior of the gas-liquid separation buffer tank main body is fixedly formed in the top of the gas-liquid separation buffer tank main body, a treatment mechanism is installed on the outer side of the gas-liquid separation buffer tank main body, and an auxiliary mechanism is installed on the outer side of the gas-liquid separation buffer tank main body; the processing mechanism comprises a plurality of gas compressor gas-liquid separators and liquid discharging branch pipes fixedly installed at the output ends of the gas compressor gas-liquid separators. The VOCs gas recovery device of the gas compressor blowdown system can safely, reliably and effectively recover VOCs gas produced in the blowdown process.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection treatment, in particular to a device for recovering VOCs gas from a sewage discharge system of a gas compressor. Background Art

[0002] Existing coke oven gas, blast furnace gas or converter gas is widely used in gas turbine power generation. Gas turbine power generation requires the gas to be compressed to a pressure of more than 3MPa. Generally, a multi-stage gas compressor is used for compression. The gas-liquid separator between the compressor stages needs to be discharged after the condensate level rises to a certain height. Since the gas pressure between the stages of the coal compressor or after the coal compressor is relatively high, part of the gas is dissolved in the condensate. As the condensate is discharged, part of the dissolved gas will precipitate from the condensate after the pressure is reduced, thereby causing environmental pollution and safety problems, which need to be solved.

[0003] In the prior art, there are generally several treatment methods: one is to use the sewage pool method, the condensate discharged from the coal press directly enters the coal press sewage pool, when the coal gas precipitated from the condensate accumulates above the sewage pool, it can be led out through a pipeline and directly discharged into the external atmosphere. This method is simple and direct, but this method pollutes the environment and has safety hazards. It is no longer allowed under the current environmental protection and safety requirements. The second is to draw the precipitated coal gas into the VOCs gas collection unit based on the first method. The unit can use RTO or directly send it to the coke oven for combustion or send it to dry quenching instead of supplementary air. This method is because the VO The gas in the Cs gas collection unit contains a high amount of H2 and is prone to explosion. A large amount of dilution gas needs to be added in advance, which is not conducive to the subsequent combustion process. Third, the gas-liquid separation buffer tank method being studied in the prior art, the gas condensate discharged from the coal compressor first enters the gas-liquid separation buffer tank designed according to the pressure vessel, and the precipitated gas will return to the gas main pipeline, and the condensate at the bottom is pumped to the biochemical or other waste liquid treatment unit, and this method has not been used in actual production before. In this regard, the present application is based on the improvement of this method and provides a device for recovering VOCs gas from the sewage system of a gas compressor to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the existing technology, the utility model provides a device for recovering VOCs gas from the sewage system of a gas compressor, which has the advantages of being able to safely and reliably recover the VOCs gas produced in the sewage process, etc., and solves the problem that the existing sewage discharge method of the gas compressor is easy to pollute the external environment in actual application and has certain safety hazards in the treatment process.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of being able to safely and reliably effectively recover the VOCs gas produced during the sewage discharge process, the utility model provides the following technical solutions: a device for recovering VOCs gas from a sewage discharge system of a gas compressor, comprising an equipment base, a gas-liquid separation buffer tank body is provided on the inner side of the equipment base, two brackets are fixedly installed between the bottom of the gas-liquid separation buffer tank body and the inner bottom wall of the equipment base, a liquid collection pit is provided on the right side of the interior of the gas-liquid separation buffer tank body, a manhole connected to the interior is fixedly installed on the top of the gas-liquid separation buffer tank body, a processing mechanism is installed on the outer side of the gas-liquid separation buffer tank body, and an auxiliary mechanism is installed on the outer side of the gas-liquid separation buffer tank body;

[0008] The processing mechanism includes a plurality of gas compressor gas-liquid separators, a drainage branch pipe fixedly installed at the output end of the gas compressor gas-liquid separator, a drainage main pipe fixedly installed between the output ends of the plurality of drainage branch pipes, a maintenance relief pipe fixedly installed at the top of the gas-liquid separation buffer tank body and with the input end extending to the inside of the gas-liquid separation buffer tank body, a maintenance relief valve fixedly installed on the maintenance relief pipe and internally connected, two pressure collecting pipes fixedly installed on the top of the gas-liquid separation buffer tank body and internally connected, a safety valve fixedly installed on the pressure collecting pipe and internally connected, and a A sewage inspection pipe, a gas recovery pipe fixedly installed on the top of the gas-liquid separation buffer tank body, two sewage discharge branches fixedly installed on the top of the gas-liquid separation buffer tank body and sharing an input end, a sewage delivery pump fixedly installed on the sewage discharge branch pipes and internally connected, a sewage discharge main pipe fixed between the output ends of the two sewage discharge branch pipes, a sewage discharge tank connected to the output end of the sewage discharge main pipe, and a gas main pipe fixedly installed at the output end of the gas recovery pipe; check valves are fixedly installed on the outsides of the gas recovery pipe and the sewage discharge main pipe, and the output end of the drainage main pipe is fixedly connected to the top of the gas-liquid separation buffer tank body.

[0009] Furthermore, the auxiliary mechanism includes a nitrogen main pipe and a steam main pipe, a replacement nitrogen pipe is fixedly installed between the output end of the nitrogen main pipe and the top of the gas-liquid separation buffer tank body, and a purge steam pipe is fixedly installed between the output end of the steam main pipe and the outer side of the maintenance sewage pipe.

[0010] Furthermore, the output end of the replacement nitrogen pipe is located on a side close to the sump, and the inspection and drainage pipe is located at the bottom of the sump.

[0011] Furthermore, two control valves are fixedly installed on the outer side of the maintenance sewage pipe, and the output end of the purge steam pipe is located between the opposite sides of the two control valves.

[0012] Furthermore, the bottom of the liquid collection pit is lower than the bottom of the gas-liquid separation buffer tank body.

[0013] Furthermore, one end of the two pressure collecting pipes away from the main body of the gas-liquid separation buffer tank is fixedly connected to the outer side of the maintenance and venting pipe.

[0014] Furthermore, the input end of the sewage discharge branch pipe extends to the bottom of the inner side of the sump.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a device for recovering VOCs gas from the sewage discharge system of a gas compressor, which has the following beneficial effects:

[0017] The VOCs gas recovery device of the gas compressor sewage system can safely and reliably recover the VOCs gas produced in the sewage discharge process through the coordinated use of the processing mechanism and the auxiliary mechanism on the top of the equipment base, and eliminates the situation of gas overflow during sewage discharge, thereby reducing the safety risks and environmental risks of on-site operations and achieving the effect of intrinsic safety. At the same time, through the coordinated use of two valves that play a safety protection role, it can be ensured that one of them can play a normal working role during the calibration or maintenance process of the other, ensuring the safety of the processing process, making the VOCs gas recovery device of the gas compressor sewage system extremely practical and conducive to wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a top view schematic diagram of the main connection structure of the gas-liquid separation buffer tank in the structure of the utility model;

[0020] Figure 3 It is a three-dimensional bottom view schematic diagram of the main connection structure of the gas-liquid separation buffer tank in the structure of the utility model.

[0021] In the figure: 1 equipment base, 201 gas-liquid separation buffer tank body, 202 bracket, 203 collecting pit, 204 manhole, 301 gas compressor gas-liquid separator, 302 drainage branch pipe, 303 drainage main pipe, 304 maintenance relief pipe, 305 maintenance relief valve, 306 pressure collecting pipe, 307 safety valve, 308 maintenance sewage pipe, 309 gas recovery pipe, 310 sewage discharge branch pipe, 311 sewage delivery pump, 312 sewage discharge main pipe, 313 sewage tank, 314 gas main pipe, 315 check valve, 401 nitrogen main pipe, 402 replacement nitrogen pipe, 403 steam main pipe, 404 purge steam pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figures 1 to 3 The utility model provides a technical solution: a device for recovering VOCs gas from a gas compressor sewage discharge system, comprising an equipment base 1, a gas-liquid separation buffer tank body 201 is arranged on the inner side of the equipment base 1, two brackets 202 are fixedly installed between the bottom of the gas-liquid separation buffer tank body 201 and the inner bottom wall of the equipment base 1, a liquid collecting pit 203 is arranged on the right side of the inside of the gas-liquid separation buffer tank body 201, a manhole 204 connected to the inside is fixedly installed on the top of the gas-liquid separation buffer tank body 201, a processing mechanism is installed on the outer side of the gas-liquid separation buffer tank body 201, and an auxiliary mechanism is installed on the outer side of the gas-liquid separation buffer tank body 201; By using the processing mechanism and the auxiliary mechanism on the top of the equipment base 1 in coordination, the VOCs gas produced during the sewage discharge process can be effectively recovered safely and reliably, and the gas overflow during sewage discharge can be prevented, thereby reducing the safety risks and environmental risks of on-site operations, and achieving the effect of intrinsic safety. At the same time, by using the two valves that play a safety protection role in coordination, it can be ensured that one of them can play a normal working role during the calibration or maintenance process, thereby ensuring the safety of the processing process, making the VOCs gas recovery device of the gas compressor sewage discharge system extremely practical and conducive to its wide promotion.

[0024] It should be noted that if Figure 2 As shown, the manhole 204 is an open structure for workers to enter and exit the equipment for installation, maintenance and safety inspection. VOCs gas is volatile organic compounds, which refers to organic compounds with high saturated vapor pressure, low boiling point and small molecular weight under standard conditions. It is easy to volatilize at room temperature and is flammable. There is a great safety risk when the solubility is high.

[0025] In this embodiment, the processing mechanism is a structure for separating and collecting VOCs gas in the condensate.

[0026] like Figure 1 and Figure 3As shown, the processing mechanism includes a plurality of gas compressor gas-liquid separators 301, a drainage branch pipe 302 fixedly installed at the output end of the gas compressor gas-liquid separator 301, a drainage main pipe 303 fixedly installed between the output ends of the plurality of drainage branch pipes 302, a maintenance relief pipe 304 fixedly installed at the top of the gas-liquid separation buffer tank body 201 and with the input end extending to the inside of the gas-liquid separation buffer tank body 201, a maintenance relief valve 305 fixedly installed on the maintenance relief pipe 304 and internally connected, two pressure collecting pipes 306 fixedly installed on the top of the gas-liquid separation buffer tank body 201 and internally connected, a safety valve 307 fixedly installed on the pressure collecting pipe 306 and internally connected, and a maintenance drainage pipe 304 fixedly installed at the bottom of the gas-liquid separation buffer tank body 201. A sewage pipe 308, a gas recovery pipe 309 fixedly installed on the top of the gas-liquid separation buffer tank body 201, two sewage discharge branches 310 fixedly installed on the top of the gas-liquid separation buffer tank body 201 and sharing an input end, a sewage delivery pump 311 fixedly installed on the sewage discharge branch pipes 310 and internally connected, a sewage discharge main pipe 312 fixed between the output ends of the two sewage discharge branch pipes 310, a sewage discharge tank 313 connected to the output end of the sewage discharge main pipe 312, and a gas main pipe 314 fixedly installed at the output end of the gas recovery pipe 309; check valves 315 are fixedly installed on the outside of the gas recovery pipe 309 and the sewage discharge main pipe 312, and the output end of the discharge main pipe 303 is fixedly connected to the top of the gas-liquid separation buffer tank body 201.

[0027] It should be noted that the bottom of the liquid collection pit 203 is lower than the bottom of the gas-liquid separation buffer tank body 201 , so that the liquid can be collected inside the liquid collection pit 203 .

[0028] At the same time, the ends of the two pressure-collecting pipes 306 away from the gas-liquid separation buffer tank body 201 are fixedly connected to the outside of the maintenance relief pipe 304, so that the three pipelines can be connected together. When the pressure exceeds the set value, the safety valve 307 opens to release. The purpose of setting two safety valves 307 is to provide safety protection when one safety valve 307 is under maintenance, calibration or failure. The pressure-collecting pipes 306 of the two safety valves 307 are collected together and merged into one pipeline with the maintenance relief pipe 304. The maintenance relief valve 305 set on the maintenance relief pipe 304 can be opened manually, which is convenient for manual control.

[0029] In addition, the input end of the sewage discharge branch pipe 310 extends to the bottom of the inner side of the sump 203, so that the two pipes can be merged into one pipe and directly inserted into the sump 203 at the bottom of the gas-liquid separation buffer tank body 201. Since the bottom elevation of the sump 203 is lower than the bottom elevation of the gas-liquid separation buffer tank body 201, all the liquid in the tank can be pumped into and discharged into the sewage tank 313.

[0030] It should also be noted that the gas-liquid separation buffer tank body 201 is a device for separating gas and liquid. Its working principle is based on Newton's second law and the characteristics of gas and liquid themselves. One or more guide plates are usually arranged inside it. Through the setting of the guide plates, the gas encounters less resistance when flowing through the guide plates, and the liquid will be intercepted by the guide plates and accumulate on the pipe wall, thereby separating the gas and liquid. This is an existing public technology, so it will not be elaborated in detail.

[0031] In this embodiment, the auxiliary mechanism is a structure used to prevent clogging by debris and to completely discharge the internal VOCs gas during the maintenance process.

[0032] like Figure 1 As shown, the auxiliary mechanism includes a nitrogen main pipe 401 and a steam main pipe 403. A replacement nitrogen pipe 402 is fixedly installed between the output end of the nitrogen main pipe 401 and the top of the gas-liquid separation buffer tank body 201, and a purge steam pipe 404 is fixedly installed between the output end of the steam main pipe 403 and the outer side of the maintenance sewage pipe 308.

[0033] It should be noted that the output end of the replacement nitrogen pipe 402 is located on the side close to the sump 203, so that the nitrogen transported from the replacement nitrogen pipe 402 to the gas-liquid separation buffer tank body 201 can fully and comprehensively replace and discharge the coal gas. The maintenance drain pipe 308 is located at the bottom of the sump 203, and two control valves are fixedly installed on the outside of the maintenance drain pipe 308. The output end of the purge steam pipe 404 is located between the opposite sides of the two control valves, so that the steam can be purged upward and downward, thereby facilitating the discharge of dirt.

[0034] The working principle of the above embodiment is:

[0035] (1) When working, the gas compressor gas-liquid separator 301 transports the discharged condensate to the inside of the gas-liquid separation buffer tank body 201. Through the two safety valves 307 set on the gas-liquid separation buffer tank body 201, when the pressure exceeds the set value, one of the safety valves 307 can be opened, thereby connecting the inside of the maintenance and relief pipe 304 to facilitate opening and relief. By setting up the two safety valves 307, when one is under maintenance, the other can be replaced to work, so that the work can be carried out continuously and the safety of the processing process is guaranteed. The pressure of the discharged gas condensate is reduced in the gas-liquid separation buffer tank body 201, and the gas is precipitated from the condensate. The precipitated gas enters the gas main pipe 314 through the gas recovery pipe 309 by self-pressure for recovery. The corresponding check valve 315 can prevent the gas from flowing back, and the condensate will be stored in the sump 203 inside the gas-liquid separation buffer tank body 201. The sewage delivery pump 311 is started to be pumped into the sewage discharge main pipe 312 through the sewage discharge branch pipe 310, and finally delivered to the sewage tank 313 for discharge. The two sewage delivery pumps 311 are used alternately to reduce the workload.

[0036] (2) To prevent the sump 203 from being blocked, the steam main pipe 403 is opened, and the steam can be transported to the sump 203 by blowing the steam pipe 404. Impurities can be discharged by inspecting the sewage pipe 308. When maintenance is required, the nitrogen main pipe 401 is opened, and nitrogen is transported to the inside of the gas-liquid separation buffer tank body 201 through the replacement nitrogen pipe 402, so that the coal gas inside the gas-liquid separation buffer tank body 201 can be completely replaced and discharged to the inside of the coal gas main pipe 314. After closing the coal gas recovery pipe 309, the maintenance work can be carried out.

[0037] Compared with the prior art, the VOCs gas recovery device of the gas compressor sewage system can safely and reliably recover the VOCs gas produced in the sewage discharge process through the coordinated use of the processing mechanism and the auxiliary mechanism on the top of the equipment base 1, and eliminates the situation of gas overflow during sewage discharge, thereby reducing the safety risks and environmental risks of on-site operations and achieving the effect of intrinsic safety. At the same time, through the coordinated use of the two valves that play a safety protection role, it can be ensured that one of them can play a normal working role during the calibration or maintenance process, ensuring the safety of the treatment process, making the VOCs gas recovery device of the gas compressor sewage system extremely practical, conducive to wide promotion, and solving the problem that the existing gas compressor sewage discharge method is easy to pollute the external environment in actual application and has certain safety hazards in the treatment process.

[0038] The electrical components appearing in the article are all electrically connected to the main controller and the power supply. The provision of power supply is common knowledge in the field. The main controller can be a conventional known device for control such as a computer, which can be realized through simple programming by technicians in the field. They are all existing public power connection technologies and will not be described in detail in the article.

[0039] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0040] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention.

Claims

1. A device for recovering VOCs gas from a gas compressor exhaust system, comprising a device base (1), characterized in that: A gas-liquid separation buffer tank body (201) is provided on the inner side of the equipment base (1); two brackets (202) are fixedly installed between the bottom of the gas-liquid separation buffer tank body (201) and the inner bottom wall of the equipment base (1); a liquid collection pit (203) is provided on the right side of the inside of the gas-liquid separation buffer tank body (201); a manhole (204) connected to the inside is fixedly installed on the top of the gas-liquid separation buffer tank body (201); a processing mechanism is installed on the outer side of the gas-liquid separation buffer tank body (201); and an auxiliary mechanism is installed on the outer side of the gas-liquid separation buffer tank body (201); The processing mechanism comprises a plurality of gas compressor gas-liquid separators (301), a drainage branch pipe (302) fixedly mounted on the output end of the gas compressor gas-liquid separator (301), a drainage main pipe (303) fixedly mounted between the output ends of the plurality of drainage branch pipes (302), a maintenance relief pipe (304) fixedly mounted on the top of the gas-liquid separation buffer tank body (201) and with the input end extending into the interior of the gas-liquid separation buffer tank body (201), a maintenance relief valve (305) fixedly mounted on the maintenance relief pipe (304) and internally connected, two pressure collecting pipes (306) fixedly mounted on the top of the gas-liquid separation buffer tank body (201) and internally connected, a safety valve (307) fixedly mounted on the pressure collecting pipe (306) and internally connected, and a maintenance drainage pipe (304) fixedly mounted on the bottom of the gas-liquid separation buffer tank body (201). 08), a gas recovery pipe (309) fixedly mounted on the top of the gas-liquid separation buffer tank body (201), two sewage discharge branch pipes (310) fixedly mounted on the top of the gas-liquid separation buffer tank body (201) and sharing a common input end, a sewage delivery pump (311) fixedly mounted on the sewage discharge branch pipes (310) and internally connected, a sewage discharge main pipe (312) fixedly mounted between the output ends of the two sewage discharge branch pipes (310), a sewage discharge tank (313) connected to the output end of the sewage discharge main pipe (312), and a gas main pipe (314) fixedly mounted on the output end of the gas recovery pipe (309); check valves (315) are fixedly mounted on the outer sides of the gas recovery pipe (309) and the sewage discharge main pipe (312); the output end of the drainage main pipe (303) is fixedly connected to the top of the gas-liquid separation buffer tank body (201).

2. The device for recovering VOCs gas from a gas compressor sewage discharge system according to claim 1, characterized in that: The auxiliary mechanism comprises a nitrogen main pipe (401) and a steam main pipe (403); a replacement nitrogen pipe (402) is fixedly installed between the output end of the nitrogen main pipe (401) and the top of the gas-liquid separation buffer tank body (201); and a purge steam pipe (404) is fixedly installed between the output end of the steam main pipe (403) and the outer side of the maintenance sewage pipe (308).

3. The device for recovering VOCs gas from a gas compressor sewage system according to claim 2, characterized in that: The output end of the replacement nitrogen pipe (402) is located on a side close to the liquid collection pit (203), and the maintenance sewage pipe (308) is located at the bottom of the liquid collection pit (203).

4. The device for recovering VOCs gas from a gas compressor sewage discharge system according to claim 2, characterized in that: Two control valves are fixedly installed on the outside of the maintenance sewage pipe (308), and the output end of the purge steam pipe (404) is located between opposite sides of the two control valves.

5. The device for recovering VOCs gas from a gas compressor sewage system according to claim 1, characterized in that: The bottom of the liquid collection pit (203) is lower than the bottom of the gas-liquid separation buffer tank body (201).

6. The device for recovering VOCs gas from a gas compressor sewage system according to claim 1, characterized in that: One end of the two pressure collecting pipes (306) away from the gas-liquid separation buffer tank body (201) is fixedly connected to the outside of the maintenance relief pipe (304).

7. The device for recovering VOCs gas from a gas compressor sewage system according to claim 1, characterized in that: The input end of the sewage discharge branch pipe (310) extends to the bottom of the inner side of the sump (203).

Images